Cousin is getting married this weekend and my hair is a mess! I need serious help please!?

So my hair is really thick and curly and if i dont straighten it everyday i look like a troll doll. When i straighten it i come out with very silky smooth "white girl" kind of hair but it takes 2 hours. Yesterday i got my hair chemically relaxed for the first time. Now my hair is so stiff and dry. It does not even move. I even did a deep conditioning treatment and i still have this ugly stiff dry and frizzy hair. I dont know what to do anymore. My cousins wedding is also this weekend. Can someone please help?!